Branson's North Carolina Business Directory for 1869 shows that Shelby, in the years immediately following the Civil War, had changed little from the rural county seat economy that it had been throughout the ante-bellum period.
Enterprise Architect provides a platform for the system engineer using the Systems Modeling Language (SysML) and model based development, and in addition to the engineering models the tool provides support for project and process management.
Chapter 2: Structural Modeling. Digital System Designs and Practices Using Verilog HDL and FPGAs @ 2008~2010, John Wiley 2-22. An Example --- A 1-Bit Full Adder. module full_adder_structural(x, y, c_in, s, c_out);